JP2015528857A - Method for manufacturing a wear-resistant roller member - Google Patents

Abstract

An abrasion resistant member for treating an abrasive is disclosed, the member including a metal body having at least one surface. This is because a metal template having a pattern of through-holes is arranged on at least one surface of the metal body, and a cover arranged to cover at least a part of the metal template is a metal mold. A gap is formed between the cover and the metal template so that a powder material suitable for sintering is introduced into the through hole in the metal template through the gap. And the metal body, metal template, cover and powder material are joined together by sintering. [Selection] Figure 2

Description

  The present invention relates to a method for producing a wear-resistant member provided with a wear-resistant layer on at least one surface of a metal body. According to this method, steel for powder metallurgy is applied to the member, whereby a wear-resistant surface is obtained when subjected to sintering. The member has a flat or curved surface and can be used in any kind of application where it is necessary to protect the surface when handling abrasive materials. This method may be used, for example, for various types of tools that are subject to extensive wear, or in the placement of conveyors for transporting abrasives, or in equipment for crushing materials. The invention also relates to a wear resistant member produced by the method according to the invention.

  In recent years, especially rollers for crushing abrasive materials have attracted a lot of attention, because known rollers are deficient in performance and durability and / or are very expensive to manufacture. by. This type of roller is well known in the patent literature, for example, US Pat. No. 6,806,003 applies a wear-resistant layer of two different powder metallurgy steels to the surface of a roller for roller presses by sintering. Describes the method. The advantage of using powder metallurgy steel is that, due to the fine microstructure and small and well-distributed carbide, a very high content hard phase and a surface with high toughness is obtained. In addition, powder metallurgy techniques allow hard phase structures that are difficult or impossible to achieve by other techniques. Hexagonal tiles are preformed with the first material, they are placed on the surface covering the largest area of the roller surface, and the second material is placed between the tiles. The first material contains a very high content of carbide and therefore has a high wear resistance, whereas the second material has a low content of carbide and therefore a high wear rate but high toughness. Yes, that is, high resistance to crack propagation. This difference in the wear and mechanical properties of the two materials will provide spontaneous wear protection and will ensure that surface destruction due to such things as playing card metals (trace added metals) is avoided. Let's go. The sintering process used is a hot isostatic press (HIP) in which the metallurgical powder is consolidated to a density of 100 percent by applying pressures exceeding 1000 bar and temperatures exceeding 1000 ° C. Because of the fact that each tile in US Pat. No. 6,860,003 is manufactured by individual sintering and compression processes, each tile must be placed on the surface of the roller one by one with relatively high accuracy, and Producing such a roller is a very time consuming process because the entire circumference of the roller must be tiled before the final sintering. As a result, manufacturing such a roller is quite expensive.

US Pat. No. 6,860,003

  The object of the present invention is to provide a wear-resistant member whose manufacturing costs are significantly reduced.

This is obtained by a method of the kind mentioned in the introductory part, which is characterized by including the following steps:
Placing a metal template having a pattern of through-holes on at least one surface of the metal body;
Providing a cover covering at least a portion of the metal template and forming a gap between the cover and the metal template by placing the cover spaced from the metal template;
Filling the through-holes of the metal template with the powder material suitable for sintering by introducing the powder material into the gap between the cover and the metal template; and the body of the metal in the sintering process Bonding metal molds, covers and powder materials together.

  This would allow the metal body to be covered with a wear resistant layer in a quick, cheap and simple manner. Furthermore, if a wear-resistant roller is required, such a roller can be produced in a single processing step for sintering, thereby significantly reducing the time required for production, and thus The cost for such a roller will also be reduced.

  The wear resistance of the metal template is preferably much lower than the wear resistance of the sintered powder material. In this way, a metal template can be made of a material that has low resistance to wear and does not use expensive and time-consuming powder technology. This would make the metal template easy and inexpensive to manufacture. The metal template is preferably made of carbon steel such as mild steel or low carbon steel.

The cover preferably covers at least a major part of the surface of the metal template covering at least a major part of the metal body in order to ensure that the surface is adequately protected.
The distance between the metal body and the cover should be at least 3 millimeters, thereby creating a sufficient space for introducing the powder material into the space between these parts.

  In order to ensure that the native layer necessary to reduce wear of the wear resistant member is formed, the size of the through holes and the distance between the through holes depends on the type and size of the material to be treated. Will depend on. The metal template is manufactured from plain carbon steel (preferably mild steel), which has a very low wear resistance against abrasive materials handled during operation, so that the metal mold can be used while operating the part. The plate will wear much faster than the surrounding sintered powder material. The areas that appear around the sintered powder material when the metal template wears out are filled with abrasives, which will wear against themselves in these areas.

  In principle, the through hole may have any conceivable shape as long as wear protection is provided when the metal template is worn. For example, the holes may be circular, square or polygonal and may be arranged at the same distance from each other or at various distances. The holes may be provided by laser cutting, which is a quick and accurate method. Punching holes is also an option, especially for mass production. To ensure advantageous wear protection, it is preferred that the holes span at least 60 percent of the surface area of the metal template.

  Sintering is preferably performed by hot isostatic pressing (HIP) processing, which ensures excellent wear resistance to the powder material, and the metal body, metal mold This is because it provides a strong bond between the plate, the cover and the powder material. A buffer layer may be used between the metal body and the metal template, but this layer can be used to obtain a stronger bond and / or for each of the metal body and the metal template. Used to make the alloy more extensive.

  The powder material to be sintered is powder metallurgical steel, which can be mixed with high melting point particles such as carbides, nitrides, oxides, borides or silicides to obtain extremely high resistance to wear. Also good.

  In the following, the invention will be described in particular with reference to an abrasion resistant roller for use in a roller press, roll mill or similar device. Such equipment typically processes granular materials such as coarse ore, cement raw materials or cement clinker.

The invention is described in more detail below with reference to the drawings.
FIG. 1 shows a three-dimensional view of an abrasion resistant roller according to the present invention. FIG. 2 shows a cross-sectional view of the roller shown in FIG. FIG. 3 shows two different aspects of the arrangement for the wear-resistant layer according to the invention.

  FIG. 1 shows a three-dimensional view of an abrasion-resistant roller 1 manufactured by the method according to the present invention. A tubular metal template 3 and a tubular metal cover 4 are arranged around a cylindrical metal body 2 so as to be concentric. The metal body 2 may be tubular as shown in FIG. The outer diameter of the tubular metal template 3 is smaller than the inner diameter of the tubular cover 4 so that a gap 7 is formed between these two parts. The size of the gap 7 in the radial direction must be large enough to allow the powder material 6 to flow along the axial direction of the cylindrical metal body 2 when the powder material 6 is introduced into the gap 7. . A buffer layer 8 is optionally provided between the metal body 2 and the metal template 3, but this layer can be used to enhance the bond between the parts.

  FIG. 2 shows a cross-sectional view through a vertical plane containing the centerline of the roller shown in FIG. The metal template 3 is manufactured from a steel plate, in which a pattern of holes 5 is cut, after which it is subjected to either hot rolling or cold rolling (depending on the thickness of the steel plate), thereby A tubular metal template 3 is formed. The powder material 6 is steel for powder metallurgy, which is introduced into the gap 7 between the metal template 3 and the cover 4, thereby filling the holes 5 in the metal template 3. Both holes 5 and gaps 7 will be filled with powder material 6. Closures (not shown) at both ends of the gap 7 will ensure that the powder material 6 is held in place before and during the sintering process. After the holes 5 are filled with the powder material 6, the entire assembly is evacuated and then the assembly is subjected to a sintering process (preferably a hot isostatic pressing process (HIP)) Thus, the metal main body 2, the metal template 3, the cover 4 and the powder material 6 are joined together.

  Since the cover 4 is made of a material that has a very low resistance to abrasion, the cover 4 will wear out quite quickly while operating the abrasion resistant roller 1. Furthermore, the metal template 3 is made of a material that has a much lower resistance to abrasion than the sintered powder material 6, which means that grooves are formed around the sintered powder material 6. Means that. These grooves will be effectively filled with fine particles of ground material. Those fine particles are compressed in the grooves and necessarily effectively retained on the surface. Thereby, spontaneous wear protection is provided when the crushed material wears against fine particles in the groove. Since this spontaneous layer build-up is enhanced by the preferred arrangement of the sintered powder material, it is very important that the holes 5 in the metal template 3 are arranged in an advantageous manner. This spontaneous effect reduces further wear of the roller and contributes to an increased throughput, since the friction between the material to be processed and the material in the groove is increased. Thus, the optimal structure of the surface of the wear resistant roller 1 will provide significant advantages for processing operations in view of its importance for reducing wear and increasing productivity.

  FIG. 3 shows two different aspects of the arrangement for the wear resistant layer. The different types of holes 5 in the metal template 3 in the two shown parts are respectively circular and polygonal, but may have other shapes. In order to ensure the formation of the spontaneous layer necessary to reduce the wear of the wear-resistant roller, the shape of the holes 5 forming a highly wear-resistant region of sintered powder material 6 and The distance between the holes 5 will depend on the type and size of the material to be processed. Typically, the holes 5 cover an area that exceeds 60 percent of the surface area of the metal template 3.

  DESCRIPTION OF SYMBOLS 1 Wear-resistant roller, 2 Metal main body, 3 Metal template, 4 Cover, 5 Through-hole, 6 Powder material, 7 Crevice, 8 Buffer layer.

The present invention relates to a method for producing an abrasion resistant roller member provided with an abrasion resistant layer on at least one surface of a metal body. According to this method, steel for powder metallurgy is applied to the member, whereby a wear-resistant surface is obtained when subjected to sintering. The member has a flat or curved surface and can be used in any kind of application where it is necessary to protect the surface when handling abrasive materials. This method may be used, for example, for various types of tools that are subject to extensive wear, or in the placement of conveyors for transporting abrasives, or in equipment for crushing materials. The invention also relates to an abrasion-resistant roller member produced by the method according to the invention.

The object of the present invention is to provide a wear-resistant roller member whose manufacturing costs are significantly reduced.

This is obtained by a method of the kind mentioned in the introductory part, which is characterized by including the following steps:
Placing a metal template having a pattern of through-holes on at least one surface of the metal body;
Providing a cover covering at least a portion of the metal template and forming a gap between the cover and the metal template by placing the cover spaced from the metal template;
Filling the through-holes of the metal template with the powder material suitable for sintering by introducing the powder material into the gap between the cover and the metal template; and the body of the metal in the sintering process a metal template, and joining together the cover and powdered material, after sintering process, Rukoto of lower than the wear resistance of the wear-resistant metal powder (6) of the metal mold plate (3).

In order to ensure that the native layer necessary to reduce wear on the wear resistant roller member is formed, the size of the through holes and the distance between the through holes depends on the type and size of the material to be treated. It will depend on you. The metal template is manufactured from plain carbon steel (preferably mild steel), which has a very low wear resistance against abrasive materials handled during operation, so that the metal mold can be used while operating the part. The plate will wear much faster than the surrounding sintered powder material. The areas that appear around the sintered powder material when the metal template wears out are filled with abrasives, which will wear against themselves in these areas.

Claims (8)

A method for producing a wear-resistant member (1), wherein a wear-resistant layer is provided on at least one surface of a metal body (2), each of the following steps:
Placing a metal template (3) with a pattern of through-holes (5) on at least one surface of the metal body (2);
A cover (4) and a metal mold are provided by providing a cover (4) covering at least a part of the metal template (3), and disposing the cover (4) at a distance from the metal template. Forming a gap (7) between the plates (3);
By introducing the powder material (6) into the gap (7) between the cover (4) and the metal template (3), the powder material (6) suitable for sintering is introduced into the metal template. Filling the through holes (5); and joining together the metal body (2), the metal template (3), the cover (4) and the powder material (6) in a sintering process;
The method comprising the steps of:   The method according to claim 1, characterized in that the wear resistance of the metal template (3) is lower than that of the sintered metal powder (6).   3. The method according to claim 1, wherein the metal template (3) is manufactured from low carbon steel.   4. The method according to claim 1, wherein the sintering process is a hot isostatic pressing process.   A wear-resistant member (1) for treating abrasive material, the wear-resistant member comprising a metal body (2) having at least one surface and having a pattern of through-holes (5) The metal plate (3) is disposed on at least one surface of the metal body (2), and the cover (4) disposed so as to cover at least a part of the metal template (3) is made of metal. Powder that is arranged at a distance from the template (3), thereby forming a gap (7) between the cover (4) and the metal template (3) and is suitable for sintering Material (6) is introduced through the gap (7) into the through hole (5) in the metal template (3) and the metal body (2), metal template (3), cover (4) ) And powder material (6) are joined together by a sintering process Sex member.   6. A wear-resistant member according to claim 5, characterized in that the distance between the metal template (3) and the metal body (2) is at least 3 millimeters.   7. A wear-resistant member according to claim 5 or 6, characterized in that the through-hole (5) covers at least 60 percent of the surface area of the metal template (3).   The wear-resistant member according to any one of claims 5 to 7, characterized in that the metal body (2) is a cylindrical roller body.

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